/** The key of the configuration. e.g. false */
    String API_JSONP_ENABLED = "api.jsonp.enabled";

    /** The key of the configuration. e.g. status,timed_out */
    String API_PING_search_engine_FIELDS = "api.ping.search_engine.fields";

    /** The key of the configuration. e.g.  */
    String VIRTUAL_HOST_HEADERS = "virtual.host.headers";

    /** The key of the configuration. e.g.  */

* Fixes API compatibility issue with empty lists incorrectly returning a null `items` field instead of an empty array. ([#39834](https://github.com/kubernetes/kubernetes/pull/39834), [@liggitt](https://github.com/liggitt))
* Re-add /healthz/ping handler in genericapiserver ([#38603](https://github.com/kubernetes/kubernetes/pull/38603), [@sttts](https://github.com/sttts))

- `CSINodeInfo` and `CSIDriver` CRDs have been installed in the local cluster. ([#72584](https://github.com/kubernetes/kubernetes/pull/72584), [@xing-yang](https://github.com/xing-yang))
- Node OS/arch labels have been promoted to GA ([#73048](https://github.com/kubernetes/kubernetes/pull/73048), [@yujuhong](https://github.com/yujuhong))

  // More info: https://examples.k8s.io/volumes/cephfs/README.md#how-to-use-it
  // +optional
  optional string user = 3;

  // secretFile is Optional: SecretFile is the path to key ring for User, default is /etc/ceph/user.secret
  // More info: https://examples.k8s.io/volumes/cephfs/README.md#how-to-use-it
  // +optional
  optional string secretFile = 4;

- Added support to restore a volume from a volume snapshot data source.  ([#67087](https://github.com/kubernetes/kubernetes/pull/67087), [@xing-yang](https://github.com/xing-yang))

- '`NodeOutOfServiceVolumeDetach` is now beta.'
   ([#113511](https://github.com/kubernetes/kubernetes/pull/113511), [@xing-yang](https://github.com/xing-yang))
- '`RetroactiveDefaultStorageClass` feature is now beta.'
   ([#113329](https://github.com/kubernetes/kubernetes/pull/113329), [@RomanBednar](https://github.com/RomanBednar))

- Locked `CSIMigrationvSphere` feature gate. ([#116610](https://github.com/kubernetes/kubernetes/pull/116610), [@xing-yang](https://github.com/xing-yang))
- Made `apiextensions-apiserver` binary linking static (also affects the deb and rpm packages). ([#114226](https://github.com/kubernetes/kubernetes/pull/114226), [@saschagrunert](https://github.com/saschagrunert))

- VolumeSnapshotDataSource moves to GA in 1.20 release ([#95282](https://github.com/kubernetes/kubernetes/pull/95282), [@xing-yang](https://github.com/xing-yang)) [SIG Apps]
- WinOverlay feature graduated to beta ([#94807](https://github.com/kubernetes/kubernetes/pull/94807), [@ksubrmnn](https://github.com/ksubrmnn)) [SIG Windows]

### Feature

* Enables VolumeSnapshotDataSource feature gate and promotes volume snapshot APIs to beta. ([#80058](https://github.com/kubernetes/kubernetes/pull/80058), [@xing-yang](https://github.com/xing-yang))
* Added appProtocol field to EndpointSlice Port ([#83815](https://github.com/kubernetes/kubernetes/pull/83815), [@howardjohn](https://github.com/howardjohn))

- Added reason to metric `attachdetach_controller_forced_detaches` in the attach detach controller. ([#119185](https://github.com/kubernetes/kubernetes/pull/119185), [@xing-yang](https://github.com/xing-yang))
- Added support for pod `hostNetwork` field selector ([#110477](https://github.com/kubernetes/kubernetes/pull/110477), [@halfcrazy](https://github.com/halfcrazy)) [SIG Apps and Node]